math help

What is 100/100 + 10/12?

What is 100/100 + 10/12?

Here's how you add

100
100
+
10
12

Step 1

Of course, you can't add two fractions if the denominators (bottom numbers) don't match. To get a common denominator, multiply the denominators together. Then we fix the numerators by multiplying each one by their other term's denominator.

Now you multiply 100 by 12, and get 1200, then we multiply 100 by 12 and get 1200.

100/100 times 12

Do the same for the second term. We multiply 10 by 100, and get 1000, then multiply 100 by 12 and get 1200.

10/12 times 100

The problem now has new fractions to add:

1200
1200
+
1000
1200

Step 2

Since our denominators match, we can add the numerators.

1200 + 1000 = 2200

The sum we get is

2200
1200

Step 3

The last step is to reduce the fraction if we can.

To find out, we try dividing it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

2200
1200
÷ 2 =
1100
600

Let's try dividing by that again...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

1100
600
÷ 2 =
550
300

Let's try dividing by that again...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

550
300
÷ 2 =
275
150

Let's try dividing by that again...

Nope! So now we try the next greatest prime number, 3...

Nope! So now we try the next greatest prime number, 5...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

275
150
÷ 5 =
55
30

Let's try dividing by that again...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

55
30
÷ 5 =
11
6

Let's try dividing by that again...

Nope! So now we try the next greatest prime number, 7...

No good. 7 is larger than 6. So we're done reducing.

There you have it! Here's the final answer to 100/100 + 10/12

100
100
+
10
12
=
11
6
© 2014 Randy Tayler

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